I agree that everybody should be able to protest. Like what Gwoash said some bans are falsely given and people who are banned should give us a legit reason to even consider unbanning them. Personally if you can't/won't read the rules and complain about being slayed,kicked,gagged,muted,ban then that's their own fault and not ours those kinds of protest should be ignored. But if you were banned for a unfair reason then by all means explain your side of the story.
This applies to all xG servers not just tf2.